Collection includes information on all aspects of criminal activities handled by the U. S. Postal Inspection Service (including mail fraud, drug trafficking, bombs, child pornography, and identity theft) as well as criminal cases undertaken by the Inspection Service for other government agencies, particularly the Department of Justice. Some examples of these cases are the Robert Hanssen spy case, the Ruby Ridge and Waco cases, and the anthrax crisis of 2001.

This file consists of information about 'Operation Avalanche,' an investigation of the largest known commercial child pornography business.